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Potassium sulfate droplets and the origin of turbidity in alabaster glass
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. kemi. (Glas)
Växjö University, Faculty of Mathematics/Science/Technology, School of Technology and Design. Kemi. (Glas)
Oorganisk Kemi, KTH.
2006 (English)In: Glass Technology : European Journal of Glass Science and Technology A, Vol. 47, no 1, p. 15-18Article in journal (Refereed) Published
Abstract [en]

A study of the criteria required to manufacture multi-component semi-transparent silicate glasses, so called “alabaster” glass, has found that the optical effect is caused by non-crystal¬line potassium sulfate droplets. The droplets were characterized by use of XRD, SEM/EDX and Raman spectroscopy. The size range of the particles is in the order of 5-50 micrometers. It was found that the droplets consisted of potassium sulfate, even if other sulfate compounds were added to the glass. The amount of sulfate compound added, the melting temperature of the furnace and the melting time have significant effect on the optical density of the glass. The optical density of the glass can be correlated to the calculated surface tension of the host glass, suggesting that phase separation of a sulfate enriched liquid phase is part of the mecha¬nism forming the droplets. By adding pigments several different colours can be obtained, but the alabaster effect is not achieved during reducing conditions, thus it seems not possible to produce colours originating from reduced pigments. Pigments tested were Cr, Fe, Co, Cu, Au, Mo/Se, Nd and Ti/Ce/Se.

Place, publisher, year, edition, pages
2006. Vol. 47, no 1, p. 15-18
Keywords [en]
glass, alabaster, optical density, phase separation, sulphate droplets
National Category
Materials Engineering Inorganic Chemistry Materials Chemistry
Identifiers
URN: urn:nbn:se:vxu:diva-2868OAI: oai:DiVA.org:vxu-2868DiVA, id: diva2:202824
Available from: 2006-08-17 Created: 2006-08-17 Last updated: 2011-01-11Bibliographically approved

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Citation style
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  • nn-NB
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  • Other locale
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  • asciidoc
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